Mercurial > lcfOS
annotate cos/kernel/initrd.c @ 41:35cc54e078dd
Added memory functions
| author | windel |
|---|---|
| date | Fri, 03 Feb 2012 17:56:41 +0100 |
| parents | 3a6a9b929db0 |
| children | e47bfef80baf |
| rev | line source |
|---|---|
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3a6a9b929db0
Added initial ramdisk and some virtual file system functions
windel
parents:
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1 /* |
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2 * Initial ramdisk filesystem driver. |
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3 * */ |
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4 |
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5 #include "kernel.h" |
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6 |
| 41 | 7 // Global data struct: |
| 8 initrd_file_header_t *files; | |
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9 |
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10 fs_node_t* initialize_initrd(uint64_t location) |
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3a6a9b929db0
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11 { |
| 41 | 12 uint32_t *u32ptr; |
| 13 | |
| 14 u32ptr = (uint32_t*)location; | |
| 15 if (*u32ptr != 0x1337babe) | |
| 16 { | |
| 17 printf("Invalid ramdisk magic\n"); | |
| 18 return 0; | |
| 19 } | |
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3a6a9b929db0
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windel
parents:
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changeset
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20 |
| 41 | 21 // Allocate root dir: |
| 22 fs_node_t *root = (fs_node_t*)kmalloc(sizeof(fs_node_t)); | |
| 23 memset(root, 0, sizeof(fs_node_t)); | |
| 24 root->flags = FS_DIRECTORY; | |
| 25 root->readdir = initrd_readdir; | |
| 26 | |
| 27 u32ptr++; | |
| 28 root->length = *u32ptr; | |
| 29 | |
| 30 // Allocate an node for each file. | |
| 31 void *x = kmalloc(sizeof(fs_node_t) * root->length); | |
| 32 memset(x, 0, sizeof(fs_node_t) * root->length); | |
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3a6a9b929db0
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33 |
| 41 | 34 for (i = 0; i < root->length; i++) |
| 35 { | |
| 36 | |
| 37 } | |
| 38 | |
| 39 return root; | |
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3a6a9b929db0
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40 } |
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3a6a9b929db0
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41 |
| 41 | 42 void load_ramdisk() |
| 43 { | |
| 44 printf("Ramdisk location: %p\n", ramdisk_location); | |
| 45 | |
| 46 fs_node_t *root = initialize_initrd(ramdisk_location); | |
| 47 | |
| 48 if (root != 0) | |
| 49 { | |
| 50 fs_node_t *node = 0; | |
| 51 int i = 0; | |
| 52 while ( (node = readdir_fs(root, i)) != 0) | |
| 53 { | |
| 54 printf("File %s\n", node->name); | |
| 55 } | |
| 56 } | |
| 57 } | |
| 58 | |
| 59 static uint64_t initrd_read(fs_node_t *node, uint64_t offset, uint64_t size, void *buffer) | |
| 60 { | |
| 61 // TODO: check errors | |
| 62 | |
| 63 if (size > node->length) | |
| 64 { | |
| 65 return 0; | |
| 66 } | |
| 67 | |
| 68 if (size + offset > node->length) | |
| 69 { | |
| 70 size = node->length - offset; | |
| 71 } | |
| 72 | |
| 73 memcpy(buffer, node.data + offset, size); | |
| 74 return size; | |
| 75 } | |
| 76 | |
| 77 fs_node_t *readdir(fs_node_t *dir, int index) | |
| 78 { | |
| 79 if (index >= dir->length) | |
| 80 { | |
| 81 return 0; | |
| 82 } | |
| 83 } | |
| 84 |